Detection of Titan Pogo Characteristics by Analysis of Random Data

Abstract

Dynamic characteristics of Titan vehicles related to the Pogo phenomenon were found through the analysis of low-level random accelerations and pressures from ground test and flight data. Natural frequencies of vibration of propellant suction lines and of flight vehicle longitudinal motion have been successfully detected from locations of peaks in auto spectra. The inflight performance of a standpipe accumulator has been evaluated by means of both auto-spectral and cross-spectral analyses. An anomalous occurrence of Pogo vibration on one flight was explained by the analysis as due to a lack of normal gas charge in the standpipes. A novel method is applied to the evaluation of the longitudinal structural dynamic model of the vehicle. The method involves the detection of 'node frequencies' at locations of accelerometers.

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Document Details

Document Type
Technical Report
Publication Date
Feb 09, 1970
Accession Number
AD0701377

Entities

People

  • R. G. Wagner
  • S. Rubin

Organizations

  • The Aerospace Corporation

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Accelerometers
  • Accuracy
  • Bandwidth
  • Deficiencies
  • Engineering
  • Frequency Bands
  • Frequency Response
  • Hydraulic Accumulators
  • Launch Vehicles
  • Measurement
  • Mechanics
  • Propellants
  • Propulsion Systems
  • Random Vibration
  • Resonance
  • Resonant Frequency
  • Spacecraft
  • Test And Evaluation
  • Test Stands
  • Vehicles

Readers

  • Aerospace Test and Evaluation
  • Allergy and Immunology.
  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.